Switching On/Off; Adjustment Of Dosing Flow Using A Frequency Converter; Operation With Electronics; Electronic Diaphragm Leakage Sensor - Grundfos DMX 227 Installation And Operating Instructions Manual

8.2 Switching on/off

Before switching on the pump, check that it is
Caution
installed correctly. Refer to sections
and 7. Commissioning
• To start the pump, switch on the power supply.
• To stop the pump, switch off the power supply.
8.3 Adjustment of dosing flow using a frequency
converter
The dosing rate can only be adjusted in the range 1:10 if a
frequency converter is installed. See installation and operating
instructions for the frequency converter!
Warning
Observe the manufacturer's instructions!
The connections must be carried out according to
these instructions.
Settings of frequency converter when used with Grundfos
dosing pumps
Pay special attention to the following parameters of the frequency
converter:
• P013 (maximum motor frequency):
– Set the frequency converter to maximum 100 Hz.
– Due to this setting, the maximum stroke frequency of the
pump cannot be exceeded.
• P086 (motor current limit):
– Do not change the default setting (150 %).
– The motor is protected by a PTC resistor. Therefore, this
parameter is not necessary.
• P081 - P085 (motor data):
– Set these parameters to the values stated on the motor
nameplate.
– Observe the manufacturer's instructions!

9. Operation with electronics

First refer to the general section
Caution
section only describes the additional functions.

9.1 Electronic diaphragm leakage sensor

9.1.1 Technical data
Model 230 V (+ 10 %/- 10 %)
Model 115 V (+ 10 %/- 10 %)
• Contact load: 250 V / 6 A, max. 550 VA
• Power consumption: 1.15 VA
• Enclosure class: IP65
• Permissible temperature range: 0 °C to +40 °C.
9.1.2 Dimensional sketch (electronics enclosure)
113.5
Fig. 13 Electronics enclosure
14
5. Installation
.
8. Operation . This
130
9.1.3 Function
Pumps prepared for diaphragm leakage detection:
• Special dosing head flange for inserting the optoelectronic
sensor
• The optoelectronic sensor contains
– infrared sender
– infrared receiver.
In case of a leaking diaphragm
• The dosing liquid penetrates the dosing head flange.
– The light refraction will be changed.
• The sensor produces a signal.
– The electronics switches two contacts. These contacts can
for instance be used to trigger an alarm device or to switch
off the pump.
Fig. 14 Diaphragm leakage sensor
9.1.4 Electrical connection of the electronics
Warning
Electrical connections must only be carried out by
qualified personnel!
Disconnect the power supply before connecting the
power supply cable and the relay contacts!
Observe the local safety regulations!
Protect the cable connections and plugs from
corrosion and moisture.
Before connecting the power supply cable, check
that the supply voltage stated on the pump
Caution
nameplate corresponds to the local electricity supply.
An incorrect power supply could destroy the unit!
To ensure electromagnetic compatibility (EMC), the input cables
and current output cables must be screened.
1. Connect the screen at one end to PE.
– Refer to the connection diagram!
2. Route input cables, current output cables and power supply
cables in separate ducts.
3. Connect the device to the power supply according to the
connection diagram.
4. Connect the electronics with the sensor according to the
connection diagram.
Warning
The potential-loaded contact 1, terminals 6 and 7, is
loaded with supply voltage.
Switch off the power supply before connecting
contact 1!
The contacts have no protective circuits. Only pure
ohmic loads may be switched. For switching the
Caution
pump motor, a contactor has to be connected
inbetween.
5. Connect contacts 1 and 2 according to individual needs.
See section 6. Electrical connections .